Rising star Yair Rodriguez made short work of returning legend BJ Penn, but he still received what could be a lengthy medical suspension following the fight.

Rodriguez attacked with a dizzying array of kicks that the UFC Hall of Fame fighter could not defend, taking Penn out 24 seconds into the second round of their main event fight on Sunday in Phoenix. Though he finished the fight quickly, Rodriguez was one of three fighters handed an indefinite suspension, pending clearance by a doctor.

The Arizona Boxing and Mixed Martial Arts Commission didn’t specify its concern for Rodriguez or for Ben Saunders and Jocelyn Jones-Lybarger, who were also issued indefinite suspensions.